What is the distance in km of a star from the earth from which light takes 10 years to reach us?

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Solution

$D e a r s t u d e n t, s p e e d o f l i g h t = 3 \times 10^{8} m / s s p e e d = \frac{d i s \tan c e}{t i m e} d i s \tan c e = s p e e d \times t i m e = 3 \times 10^{8} \times 10 \times 365 \times 24 \times 60 \times 60 = 9.46 \times 10^{16} m = 9.46 \times 10^{13} k m R e g a r d s$

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What is the distance in km of a star from the earth from which light takes 10 years to reach us?

Dear student,speed of light=3×108m/sspeed=distancetimedistance=speed×time=3×108×10×365×24×60×60=9.46×1016m=9.46×1013kmRegards

$D e a r s t u d e n t, s p e e d o f l i g h t = 3 \times 10^{8} m / s s p e e d = \frac{d i s \tan c e}{t i m e} d i s \tan c e = s p e e d \times t i m e = 3 \times 10^{8} \times 10 \times 365 \times 24 \times 60 \times 60 = 9.46 \times 10^{16} m = 9.46 \times 10^{13} k m R e g a r d s$